Merge js-libp2p-{core pieces} into js-libp2p repo

[daviddias]

Following ipfs/js-ipfs#2222, the proposal is to:

Merge into js-libp2p, the following modules:

• js-libp2p-connection-manager
• js-libp2p-identify
  - [ ] js-libp2p-keychain
  - [ ] js-libp2p-nat-mngr
• js-libp2p-pnet
• js-libp2p-ping
• js-libp2p-switch refactor: add js-libp2p-switch to the libp2p codebase #388
• js-libp2p-circuit

Cleanup

NPM Deprecation Notice

• https://www.npmjs.com/package/libp2p-circuit
• https://www.npmjs.com/package/libp2p-connection-manager
• https://www.npmjs.com/package/libp2p-identify
• https://www.npmjs.com/package/libp2p-pnet
• https://www.npmjs.com/package/libp2p-ping
• https://www.npmjs.com/package/libp2p-switch

Readme Deprecation Notice

• js-libp2p-circuit
• js-libp2p-connection-manager
• js-libp2p-identify
• js-libp2p-pnet
• js-libp2p-ping
• js-libp2p-switch

Github Archival

Description replacement: [DEPRECATED]: now part of the https://github.com/libp2p/js-libp2p repo

• js-libp2p-circuit
  • Update description
• js-libp2p-connection-manager
  • Update description
• js-libp2p-identify
  • Update description
• js-libp2p-pnet
  • Update description
• js-libp2p-ping
  • Update description
• js-libp2p-switch
  • Update description

[jacobheun]

I put together a Draft PR of this, #388, for just libp2p-switch so we can chat about the approach there.

[jacobheun]

@daviddias each module has been deprecated on npm, and the readme's all include the notice and a link to js-libp2p. I added TODOs to the issue description, #384 (comment), to archive and update the description of each repo. If you could help with that, it would be much appreciated! ❤️

[daviddias]

@jacobheun done! Thank you for making it super simple :)

[vasco-santos]

Can we close this? Or should we wait on libp2p-keychain PR to be merged?

[jacobheun]

Yes! libp2p-keychain can and probably should be a separate effort.

[daviddias]

PR to follow for those interested #525